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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e57ec60c6e41f97df5edcaa44f94ab4057b85e100ee00a177f84245c1bc2258' 
  AND token = '4IBCFcesLsaJNXi0fGemOVPh2kjFL+J7cU2ug4771sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}